Without microscopes and other modern equipment, attempts to teach science were futile.
没有显微镜及其他现代化的
, 
教授自然科学是不会有成果的。
效的, 用的, 
的词词
词益的;的;用;
的;用的;的;效的;指引的,不明智的;Without microscopes and other modern equipment, attempts to teach science were futile.
没有显微镜及其他现代化的, 教授自然科学是不会有成果的。
He is a futile sort of person.
他是一个没有用的人。
They were killed, to the last man, in a futile attack.
因为进攻失败, 他们全部被杀, 
一幸免。
Their efforts to revive him were futile.
他们对他抢救效。
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